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551E and 552E

Parametric Equalizers

User

’s

Guide

551E

552E

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Summary of Contents for 551E

Page 1: ...551E and 552E Parametric Equalizers User s Guide 551E 552E ...

Page 2: ...cy without notice 1998 Symetrix Inc All right reserved Symetrix is a registered trademark of Symetrix Inc Mention of third party products is for informational purposes only and constitutes neither an endorsement nor a recommendation Symetrix assumes no responsibility with regard to the performance or use of these products Under copyright laws no part of this manual may be reproduced or transmitted...

Page 3: ...lanced output that com pletely removes all DC offset and direct coupled input and output stages that maximize the 551E 552E s low frequency response while minimizing noise and distortion Inside and out the 551E 552E is designed to stand up to the worst abuse your roadies can dish out The tour worthy all steel chassis houses a double sided fiberglass circuit board a significant advantage over the m...

Page 4: ...ed in this manual Some paragraphs may use Note Caution or Warning as a heading or certain typefaces and capitalization are used to identify certain words These are Note Identifies information that needs extra emphasis A Note generally supplies extra information to help you to better use the 551E 552E Equipment Markings Operator Safety Summary Chapter 2 Caution Identifies information that if not he...

Page 5: ...s button IN Set the Input Gain control to 12 00 unity gain Turn the Low Cut control fully counter clockwise and the High Cut control fully clockwise Set all five Cut Boost controls to 12 00 zero detent You are ready to start Now read the manual Fast Set Up This is the section for those of you who are really in a hurry and cannot take a moment to wade through another owner s manual Just follow thes...

Page 6: ...00 15 000 20 000 AMPL dBu 20 100 1k 10k 20k FREQ Hz Bypass Button Push this button into the ACTIVE position to engagethe551E 552E scircuitry TheBY PASS out position shunts the input signal directly from the input jacks to the output jacks via a relay There are no passive or active components in the signal path in this mode Note The relay mechanism is also engaged when the AC power is disconnected ...

Page 7: ... 000 20 000 AMPL dBu 20 100 1k 10k 20k FREQ Hz BAND 1 Hz OCT BANDWIDTH FREQUENCY CUT BOOST dB 12 850 1 5K 20 2 0 05 2K 140 X1 X0 1 X10 100 350 1 0 0 Bandwidth This knob determines how wide an area the band will affect hence the term bandwidth The knob is calibrated in terms of octaves The range is 05 1 20th to 2 octaves Use the 05 setting for notch filter applications and the 1 0 2 0 range for ton...

Page 8: ...en you put the toggle in the X1 position the range of the Frequency control corresponds to the numbers printed around the knob 100 Hz to 2kHz Use this position when you want to work in the midrange The X10 position shifts the Frequency knob s range upward by a factor of 10 The range becomes 1kHz to 20 kHz suitable for high frequency adjustments The X0 1 position moves the range downwards 10 Hz to ...

Page 9: ...gh pin3 low Balanced tip high ring low sleeve ground See Appendix A for adapter wiring examples Figure 8 View of rear panel connectors INPUT BALANCED UNBALANCED BALANCED OUTPUT BALANCED 3 INPUT 2 2 1 3 RING TIP SLEEVE 1 OUTPUT TYPICAL BALANCED CONNECTIONS UNBALANCED BALANCED RING LOW PIN 3 SLEEVE GND PIN 1 TIP HIGH PIN 2 Output Jacks There are two output jacks wired parallel to each other a balanc...

Page 10: ...8 551E 552E ...

Page 11: ...h until the offending note gets really loud Although this will sound incredibly bad it lets you know that you have adjusted the FREQUENCY control correctly Now adjust the CUT BOOST try a starting cut of around 3 6dB and BANDWIDTH try widening it a little until the open A string sounds like it should Operating Tips Chapter 6 Most professional engineers follow this rule of thumb Use narrow bandwidth...

Page 12: ...o ensure the most accurate band interactionwhile maintaining the best noise and distortion performance Tomaximizethe performance of this type of layout make sure you use adjacent EQ bands i e Bands 1 and 2 2 and 3 3 and 4 etc when you are applying overlapping boosts or cuts Diagram 9 shows how adjacent overlap ping bands produce a curve that is the result of correctly adding the curves of the indi...

Page 13: ...equires special attention from drums to vocals Multitrack Recording During tracking the 551E or one channel of the 552E could either be placed in the insert point of a console channel or if you are using a direct to tape approach following the mic preamp Use the 551E 552E for creative sweetening of the sound source or to minimize unwanted noises that exist within the signal you wish to record Full...

Page 14: ...he audio chain after the final limiter the frequencies you boost will cause over modulation of the transmitter If the 551E 552E connects directly to the output of the console sloppy board operation and unusually loud peaks may combine to overload the equalizer s input in spite of its 22 dBu headroom Ideally an AGC like the Symetrix 422 AGC Leveler should be installed between the console output and...

Page 15: ... connector wiring Check for ground loops between intercon nected system equipment Are all system components on the same AC ground Noise hiss Put551E 552EintoBYPASS Ifproblem remains check your signal source Is the input signal already noisy Listen up stream fromthe551E 552Etodetermine that you are feeding it a clean signal Check input signal levels and input level control settings The input signal...

Page 16: ...emes of their ranges shall be 20Hz to62kHz 0 5dB 3dB Thetotalharmonic distortion plus noise shall be less than 0 002 EQ in all bands flat The dynamic range shall Architects and Engineers Specifications Chapter 9 Maximum Input Level 21 dBu balanced Maximum Output Level 21 dBu balanced 17 dBu unbalanced THD Noise 1kHz at 4dBu 0 002 10 Hz to 30 kHz measurement bw eq in all bands flat Signal to Noise ...

Page 17: ...ges shall be 20Hz to62kHz 0 5dB 3dB Thetotalharmonic distortion plus noise shall be less than 0 002 Architects and Engineers Specifications Chapter 10 Maximum Input Level 21 dBu balanced Maximum Output Level 21 dBu balanced 17 dBu unbalanced THD Noise 1kHz at 4dBu 0 002 10 Hz to 30 kHz measurement bw eq in all bands flat Signal to Noise Ratio 96 dB unweighted ref to 4dBu eq in all bands flat Dynam...

Page 18: ... hereunder are SOLELY and exclusively as stated herein This Symetrix product is designed and manufactured for use in professional and studio audio systems and is not intended for other usage With respect to products purchased by consum ers for personal family or household use Symetrix expressly disclaims all implied warran ties including but not limited to warranties of merchantability and fitness...

Page 19: ...ollect shipments Just do these five things and repairs made in warranty will cost you only one way freight charges We ll prepay the return surface freight If you choose to send us your product in some sort of flimsy packaging we ll have to charge you for proper shipping materials If you don t have the factory packaging materials then do yourself a favor by using an oversize carton wrap the unit in...

Page 20: ... SLEEVE GROUND LOW MALE TRS PLUG TIP HIGH RING LOW SLEEVE GROUND MALE TRS PLUG TIP HIGH RING LOW SLEEVE GROUND MALE TS PLUG TIP HIGH SLEEVE GROUND LOW MALE TS PLUG TIP HIGH SLEEVE GROUND LOW TERMINAL STRIP HIGH LOW GROUND TERMINAL STRIP HIGH LOW GROUND TERMINAL STRIP HIGH NOT USED GROUND FEMALE XLR PIN 1 GROUND LOW PIN 2 HIGH PIN 3 NOT USED 2 2 2 3 3 3 1 1 1 RING RING SLEEVE SLEEVE TO BALANCED IN ...

Page 21: ...eral use EN 50081 1 Electromagnetic compatibility Generic emission standard Part 1 Residential commercial and light industry EN 50082 1 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry Thetechnicalconstructionfileismaintainedat Symetrix Inc 14926 35th Ave West Lynnwood WA 98037 2303 USA TheauthorizedrepresentativelocatedwithintheEuropeanCommu...

Page 22: ...20 551E 552E 14926 35th Ave West Lynnwood WA 98037 USA Tel 425 787 3222 Fax 425 787 3211 Email symetrix symetrixaudio com Website www symetrixaudio com ...

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